USWS
Unsteady State Wellbore Simulator
ü Production
Well Optimization
ü Liquid
Loading prediction
ü Gas
lift modelling
ü Low
Introductory Pricing
FEATURES
Full Wellbore
Segment simulations – more powerful than nodal analysis
Ø
Solves mass balance equations for the
segments of the pipes in a well to obtain pressure, saturation and rate
profiles.
Ø
Calculates changing pressures,
saturations, rates in wellbore as
reservoir influx or well offtake/injection changes with time
Ø
Co-current and counter-current
multiphase flow in vertical/inclined/horizontal pipe using Beggs-Brill
multiphase correlation
Black Oil/
Gas Condensate/ Gas-Water PVT data
Ø
Oil/Gas/Water Formation Volume
Factors and Viscosities, Solution Gas-Oil Ratio, Condensate-Gas Ratio
Wellbore is
divided into segments of user specified length
Ø
Using well deviation survey, well
trajectory is divided into segments for flow/mass calculation
Ø
Multiple pipes of varying diameter,
concentric and also side by side.
Ø
Segments can be perforated/plugged
for reservoir and inter-pipe flow.
Ø
Transient calculation of Pressure,
Oil/Water/Gas Rates and Saturations in wellbore segments.
Reservoir
Connection
Ø
Multiple wellbore segments can be
connected to reservoir at different times
Ø
Multiple attached reservoirs can be
defined with varying Pressure, oil/water/gas saturations, PVT tables, Relative
Permeability tables for variable influx calculation.
Ø
Reservoir influx rates can be also be
specified directly and changed with time.
Multiple pipe
offtake/injection points.
Ø
Time dependent pressure and maximum
production/injection rate constraints.
Ø
Produce reservoir fluid from one pipe
and inject into another pipe of the well ( eg Gas
lifting)
Pump head curves, inline chokes, Flow Control Devices
Ø
Position, size or modify with time to
optimize well flow
Applications
ü Detailed analysis of wellbore flow
for different pipe configurations and operating conditions as a function of
time. Obtain pressure, saturations, flow rates and direction of flow for
individual segments of discretized pipes. Optimize number of pipes, pipe
sizing, and perforations by analysis of pressure drop and rates.
ü Position and size
inline choke, flow control devices and pumps
ü Estimate when liquid loading occurs
by changing reservoir pressure, gas-liquid ratios, offtake pressures with time
until well stops flowing.
ü Model gas lift injection
to unload liquid water or condensate.
Simulate varying gas lift rates, tubing string sizes and pressures.
ü Multiple reservoir zones -
Multiple wellbore segments may be joined to reservoir – model a well producing
from several reservoirs of different PVT properties, commingled into the same
producing tubing or with packers separating flow into annuli and production
tubing.
ü Model a long horizontal well
with many wellbore segments producing from several reservoir zones or hydraulic
fracs as function of time.
Easy to Use Graphical Interface
Data File
Builder
·
Create new, modify and save data sets
·
Tab identified Input forms with
Spreadsheets, List boxes, error checking
·
Specify Timestep size and output
intervals, restart file writes
·
Black Oil PVT data from Correlation
·
Import Wellbore survey to discretize
well
·
Specify pipe sizes, perforations,
chokes, pumps- change with time
·
Enter Reservoir pressures,
saturations, or fixed rates as function of time
·
Specify offtake points with
pressure and maximum withdrawal rates,
injection points with pressure and injection rates
·
Pump head curve
Run Data
Files
·
Select a list of data files to run 2
at a time.
·
Review simulator messages
·
Open Data File or Results file of
selected run file
Review
Results
·
Select pipes, series, and times for
spreadsheet report of segments.
·
Report rates, cumulatives at production/injection
points
·
Report reservoir rates and
cumulatives
·
Graph reports
·
Wellbore schematic of report
parameters colored and animated with time
Help PDF
documentation
Tutorial
Movies
·
How to use videos
YouTube Channel
·
Videos of simulation of Wellbore with
Time for Liquid Loading and Gas Lift
Playlist https://www.youtube.com/playlist?list=PLL7cbAoGCdeL3LknZaOTyc72e8LR3VlTE
USWS Overview
Overview of
the User Interface of the Unsteady State Wellbore Simulator (USWS) with Black
Oil PVT properties
Click to
watch https://youtu.be/_iJsjbcnTXQ
USWS - Gas Bubble Rising in a Pipe filled with Water
Shows
multiphase counter current flow of gas and water in a vertical pipe.
Gravity
segregation of gas and water.
Click to
watch https://youtu.be/3_rL_EMRTC8
USWS - Gas water loading – then add gaslift tubing
Decline
reservoir pressure until upward gas-water flow stops and water loading occurs.
Add gas lift
tubing and inject gas rate to extend production period.
USWS – Oil Well Depletion with Gas Lift
Oil Well
Reservoir Pressure declines until well stops flowing. Gas Lift injection to
extend production. Increase gas lift
rate with time.
USWS - Gas Condensate Loading with gas lift
Depletion of
gas condensate reservoir, showing well condensate and gas rates as reservoir
pressure decreases with time. Shows
condensate loading when pressure drops too low to flow. Adding gas lift to
maintain production. Too much gas lift
gas restricts condensate recovery.
USWS – Oil Well depletion - add a pump to extend
production
Well producing oil and water – decline
reservoir pressure until well stops flowing.
Add a tubing string with pump and size head curve to extend production
of well.
USWS – Liner FCDs and Inline choke
How to place
liner chokes and inline chokes to control production
For more information, contact:-
T.T.
& Associates Inc
C/o
PetroStudies Consultants Inc
#204,
4603 Varsity Drive NW
Calgary,
Alberta, T3A 2V7, Canada
Phone: 403-265-9722
Email:
tant@petrostudies.com
Website:
www.petrostudies.com
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